One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,7)(4,8)(5,6)(9,10)(11,14)(12,13)(15,16)(17,18,21,26)(19,28,30,23)(20,32,34,25)(22,24,36,27)(29,38,33,41)(31,39,44,37)(35,42,46,40)(43,47,45,48)(2,6)(4,7)(10,13)(11,15)(17,19)(18,23)(20,33)(21,30)(22,31)(24,37)(25,41)(26,28)(27,39)(29,34)(32,38)(35,45)(36,44)(40,48)(42,47)(43,46) involution — undirected(1,3,5,8)(2,7,6,4)(9,11,12,15)(10,14,13,16)(18,24)(20,34)(22,36)(23,37)(25,42)(26,27)(28,39)(29,33)(31,44)(32,40)(38,48)(41,47)(2,6)(3,8)(10,13)(14,16)(17,20,21,34)(18,25,26,32)(19,29,30,33)(22,35,36,46)(23,38,28,41)(24,40,27,42)(31,43,44,45)(37,47,39,48)(1,4,5,7)(2,8,6,3)(18,26)(19,30)(20,34)(24,27)(31,44)(35,46)(38,41)(47,48)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.